William gast



(No' Model.)

W. GAST'. v Deviqe-frfiecllririg Forms on "Beds of: Printing Presses'.

No. 236,797. Patentedllan. 18, 1881-.

n WITNESSES v INVENTOR N. PETEKS PHDTQUTHDGRAPHER, WASHINGTON, D C.

' UNITED STATES PATENT ()EEIcE.

WILLIAM GAST, OF NEW YORK, N. Y.

SPECIFICATION forming part of Letters Patent No. 236,797, dated January18, 1881.

Application filed June 9, 1880. (No model.)

city, county, and State of New York, have invented certain new anduseful Improvements in Devices for Securing Forms on Beds ofPrinting-Presses, of which the following is a specification.

The object of this invention is to furnish, for the purpose of securingthe forms on the beds of printing-presses, an improved device which canbe adjusted to any size of form with great facility, and without the useof the blocks and wedges at present in use.

The invention consists of two parallel facebars, which are connected bytwo sets of toggle-levers, the intermediate pivots of said levers beingconnected to parallel toothed bars, which are guided in a common frame,and adapted for adjustment in either direction by a common pinion andpawl-and-ratchet device, so that the face-bars can be adjusted andlocked closer to or farther away from each other.

In the accompanying drawings, Figure 1 represents a top view of myimproved device for securing forms on beds of printing-presses. Fig. 2is a vertical transverse section of the same on line w as, Fig. 1; andFig. 3 is a detail view of the pinion and pawl-and-ratchet mechanismwith the covering-plate removed.

Similar letters of reference indicate corresponding parts.

In the drawings A A represent the parallel face bars, which arepreferably ribbed or notched on their outer faces, and placed rebetweenthe toggle-levers B. A pinion, a, in

the center of the guide-frame Dis arranged to intermesh with the toothedbars 0, the bars beingretained in contact with the pinion by theguide-frame D. The pinion is turned by of a face-disk, a, of the pinion.By turning the pinion-in one direction the toothed bars are moved awayfrom each other, so as to draw the face-bars A toward each other, whileby turning the pinion in opposite direction the toothed bars arecarried, by the action of the toggle-levers, to a greater or lessdistance away from each other. The face-bars may thereby be adjusted toany required distance from each other, according to the size of the formand the space between the same and the end flange of the bed-plate ofthe printing-press.

The face-disk a of the pinion a is provided with ratchet-teeth at itscircumference, in to which a spring-pawl, b, is thrown, which retainsthe pinion, so as to lock thereby the toothed bars, levers, andface-bars into the exact position desired.

The device is quickly adjusted to the form by setting the face-bars bythe pinion and key, or removed by withdrawing the spring-pawl from theratchet, so that the distance between the face-bars can be reduced.

By the device considerable time is saved in securing the forms on thebeds of printingpresses, while the form is firmly and reliably held inposition, as soon as the locking device is properly set between the sameand the bedplate of the press.

Having thus described my invention, I claim as new and desire to secureby Letters Patcut- The combination of parallel face-bars A A, connectingtogglelevers B B, and intermediate parallel rack-bars O G, pivoted tothe connecting-pins of the toggle-levers, with a guidecasing, D, for therack-bars, and with an intermediate adj ustin g-pinion,a; ratchetedface-disk a, and lockin g spring-pawl 12, substantially as set forth.

In testimony that I claim the foregoing as my invention I have signed myname, in presence of two witnesses, this 1st day of June, 1880.

WM. GAST.

Witnesses PAUL GoEPEL, CARL KARP.

